diff --git a/spiOverJtag/.gitignore b/spiOverJtag/.gitignore
new file mode 100644
index 0000000..a9a5aec
--- /dev/null
+++ b/spiOverJtag/.gitignore
@@ -0,0 +1 @@
+tmp
diff --git a/spiOverJtag/Makefile b/spiOverJtag/Makefile
new file mode 100644
index 0000000..8be7aa5
--- /dev/null
+++ b/spiOverJtag/Makefile
@@ -0,0 +1,14 @@
+VIVADO := vivado -nolog -nojournal -mode batch -source
+MODEL = xc7a35
+PRJ = spiOverJtag_$(MODEL)
+
+BIT_PATH     = tmp/$(PRJ).runs/impl_1/
+BIT_TMP_FILE = $(BIT_PATH)/*.bit
+BIT_FILE = $(PRJ).bit
+
+$(BIT_FILE) : $(BIT_TMP_FILE)
+	cp $(BIT_TMP_FILE) $(BIT_FILE)
+$(BIT_TMP_FILE): xilinx_spiOverJtag.vhd constr.xdc
+	$(VIVADO) xilinx_spiOverJtag.tcl -tclargs $(MODEL)
+clean:
+	-rm -rf tmp *.jou *.log .Xil
diff --git a/spiOverJtag/constr.xdc b/spiOverJtag/constr.xdc
new file mode 100644
index 0000000..72cd66b
--- /dev/null
+++ b/spiOverJtag/constr.xdc
@@ -0,0 +1,9 @@
+set_property CFGBVS VCCO [current_design]
+set_property CONFIG_VOLTAGE 3.3 [current_design]
+set_property BITSTREAM.CONFIG.SPI_BUSWIDTH {4} [current_design]
+
+set_property -dict {PACKAGE_PIN L13 IOSTANDARD LVCMOS33} [get_ports {csn}];
+set_property -dict {PACKAGE_PIN K17 IOSTANDARD LVCMOS33} [get_ports {sdi_dq0}];
+set_property -dict {PACKAGE_PIN K18 IOSTANDARD LVCMOS33} [get_ports {sdo_dq1}];
+set_property -dict {PACKAGE_PIN L14 IOSTANDARD LVCMOS33} [get_ports {wpn_dq2}];
+set_property -dict {PACKAGE_PIN M14 IOSTANDARD LVCMOS33} [get_ports {hldn_dq3}];
diff --git a/spiOverJtag/spiOverJtag_xc7a35.bit b/spiOverJtag/spiOverJtag_xc7a35.bit
new file mode 100644
index 0000000..10c756d
Binary files /dev/null and b/spiOverJtag/spiOverJtag_xc7a35.bit differ
diff --git a/spiOverJtag/xilinx_spiOverJtag.tcl b/spiOverJtag/xilinx_spiOverJtag.tcl
new file mode 100644
index 0000000..e404bc4
--- /dev/null
+++ b/spiOverJtag/xilinx_spiOverJtag.tcl
@@ -0,0 +1,38 @@
+set model [lindex $argv 0]
+
+set project_name "spiOverJtag_${model}"
+
+set build_path tmp
+file delete -force $build_path
+
+# Project creation
+create_project $project_name $build_path -part xc7a35ticsg324-1L
+
+add_files -norecurse xilinx_spiOverJtag.vhd
+add_files -norecurse -fileset constrs_1 constr.xdc
+
+set_property VERILOG_DEFINE {TOOL_VIVADO} [current_fileset]
+
+# set the current synth run
+current_run -synthesis [get_runs synth_1]
+reset_run synth_1
+
+set obj [get_runs impl_1]
+set_property AUTO_INCREMENTAL_CHECKPOINT 1 [get_runs impl_1]
+
+set_property "needs_refresh" "1" $obj
+
+# set the current impl run
+current_run -implementation [get_runs impl_1]
+
+puts "INFO: Project created: $project_name"
+
+launch_runs synth_1 -jobs 4
+wait_on_run synth_1
+## do implementation
+launch_runs impl_1 -jobs 4
+wait_on_run impl_1
+## make bit file
+launch_runs impl_1 -jobs 4 -to_step write_bitstream
+wait_on_run impl_1
+exit
diff --git a/spiOverJtag/xilinx_spiOverJtag.vhd b/spiOverJtag/xilinx_spiOverJtag.vhd
new file mode 100644
index 0000000..9358d65
--- /dev/null
+++ b/spiOverJtag/xilinx_spiOverJtag.vhd
@@ -0,0 +1,97 @@
+library IEEE;
+use IEEE.STD_LOGIC_1164.all;
+use IEEE.NUMERIC_STD.all;
+Library UNISIM;
+use UNISIM.vcomponents.all;
+
+entity xilinx_spiOverJtag is
+	port (
+		csn       : out std_logic;
+		sdi_dq0   : out std_logic;
+		sdo_dq1   : in std_logic;
+		wpn_dq2   : out std_logic;
+		hldn_dq3  : out std_logic
+	);
+end entity xilinx_spiOverJtag;
+
+architecture bhv of xilinx_spiOverJtag is
+	signal capture, drck, sel, shift, update : std_logic;
+	signal runtest : std_logic;
+	signal tdi, tdo   : std_logic;
+	signal fsm_csn : std_logic;
+
+	signal tmp_up_s, tmp_shift_s, tmp_cap_s : std_logic;
+begin
+	wpn_dq2 <= '1';
+	hldn_dq3 <= '1';
+	-- jtag -> spi flash
+	sdi_dq0 <= tdi;
+	tdo <= tdi when (sel) = '0' else sdo_dq1;
+	csn <= fsm_csn;
+
+	tmp_cap_s <= capture and sel;
+	tmp_up_s <= update and sel;
+	tmp_shift_s <= shift and sel;
+
+	process(drck, runtest) begin
+		if runtest = '1' then
+			fsm_csn <= '1';
+		elsif rising_edge(drck) then
+			if tmp_cap_s = '1' then
+				fsm_csn <= '0';
+			elsif tmp_up_s = '1' then
+				fsm_csn <= '1';
+			else
+				fsm_csn <= fsm_csn;
+			end if;
+		end if;
+	end process;
+
+	startupe2_inst : STARTUPE2
+	generic map (
+		PROG_USR => "FALSE",  -- Activate program event security feature. Requires encrypted bitstreams.
+		SIM_CCLK_FREQ => 0.0  -- Set the Configuration Clock Frequency(ns) for simulation.
+	)
+	port map (
+		CFGCLK    => open, -- 1-bit output: Configuration main clock output
+		CFGMCLK   => open, -- 1-bit output: Configuration internal oscillator clock output
+		EOS       => open, -- 1-bit output: Active high output signal indicating the End Of Startup.
+		PREQ      => open, -- 1-bit output: PROGRAM request to fabric output
+		CLK       => '0',  -- 1-bit input: User start-up clock input
+		GSR       => '0',  -- 1-bit input: Global Set/Reset input (GSR cannot be used for the port name)
+		GTS       => '0',  -- 1-bit input: Global 3-state input (GTS cannot be used for the port name)
+		KEYCLEARB => '0',  -- 1-bit input: Clear AES Decrypter Key input from Battery-Backed RAM (BBRAM)
+		PACK      => '1',  -- 1-bit input: PROGRAM acknowledge input
+		USRCCLKO  => drck, -- 1-bit input: User CCLK input
+		USRCCLKTS => '0',  -- 1-bit input: User CCLK 3-state enable input
+		USRDONEO  => '1',  -- 1-bit input: User DONE pin output control
+		USRDONETS => '1'   -- 1-bit input: User DONE 3-state enable output
+	);
+
+   
+	bscane2_inst : BSCANE2
+		generic map (
+			JTAG_CHAIN => 1  -- Value for USER command.
+		)
+		port map (
+			CAPTURE => capture, -- 1-bit output: CAPTURE output from TAP controller.
+			DRCK	=> drck,    -- 1-bit output: Gated TCK output. When SEL
+								--               is asserted, DRCK toggles when
+								--               CAPTURE or SHIFT are asserted.
+			RESET   => open,    -- 1-bit output: Reset output for TAP controller.
+			RUNTEST => runtest, -- 1-bit output: Output asserted when TAP
+								--               controller is in Run Test/Idle state.
+			SEL	    => sel,     -- 1-bit output: USER instruction active output.
+			SHIFT   => shift,   -- 1-bit output: SHIFT output from TAP controller.
+			TCK     => open,    -- 1-bit output: Test Clock output.
+			                    --               Fabric connection to TAP Clock pin.
+			TDI     => tdi,     -- 1-bit output: Test Data Input (TDI) output
+			                    --               from TAP controller.
+			TMS     => open,    -- 1-bit output: Test Mode Select output.
+			                    --               Fabric connection to TAP.
+			UPDATE  => update,  -- 1-bit output: UPDATE output from TAP controller
+			TDO     => tdo      -- 1-bit input: Test Data Output (TDO) input
+			                    --              for USER function.
+		);
+
+end architecture bhv;